I own an Apple TV 4 and MrMc is working great on it.
I used to have Kodi on an Android based box, and I'm missing some addons (official ones, published in the Kodi repo), but that's all right, since the Apple TV store as much to offer as well.
I've got it connected to my Synology NAS via SMB and up to this date, I haven't noticed a single flaw in playing whatever I stream.
I'm using the Amber theme, which I prefer over Confluence, but I would also appreciate to have logos on it and different lists like in the skins I used to have on Kodi (Arctic Zephyr, Eminence, etc.).
I know Python is not there anymore but and effort in providing some other non-Python addons could be made in order to bring MrMc even closer to Kodi.
As a whole, I believe this is a wonderful software and any improvements are always welcome. So, keep up the excellent work.